System, method, core drill bit and core drilling machine for hole drilling in an object

Method for hole drilling in an object (400) with a core drilling machine (100), a core drill bit (200) and a reaction bar (300) arranged for transmitting rotating reaction forces from the core drilling machine (100) to the object (400), where the core drill bit (200) is connected to the core drilling machine (100) and the core drilling machine (100) is equipped with a power source (108) in order to apply a rotating force to the core drill bit (200), and where the core drill bit (200) has an axially extending tubular shaft (202) with an inner envelop surface (203) defining an inner periphery (204) of the core drill bit (200);

• the method comprising the steps of:
• non-rotatably connecting a front portion (301) of the reaction bar to the object (400) and a rear portion (302) of the reaction bar to the core drilling machine (100), where the reaction bar (300) is non-rotatably connected to the core drilling machine (100) inside the inner periphery (204) of the axially extending tubular shaft (202) of the core drill bit (200);
• performing the drilling operation with the reaction bar non-rotatably connected to the core drilling machine (100) and the object (400).

Core drill bit (200) for hole drilling in an object (400), wherein:

• the core drill bit (200) has an axially extending tubular shaft (202) with an inner envelop surface (203) defining an inner periphery (204) of the core drill bit (200), and a connection member (201) for connection of the core drill bit (200) to a core drilling machine (100), and
• a reaction bar opening (210) is provided radially inside the connection member (201) allowing a reaction bar (300) arranged for transmitting rotating reaction forces from the core drilling machine (100) to the object (400) to be non-rotatably connected to the core drilling machine (100) and arranged inside the inner periphery (204) of the axially extending tubular shaft (202) of the core drill bit (200) when the core drill bit (200) is connected to the core drilling machine (100).

Core drilling machine (100) for hole drilling in an object (400), wherein:

• the core drilling machine (100) has a connection device (111) with a receiving section (112) configured to non-rotatably connect a reaction bar (300) to the core drilling machine (100),
• the reaction bar (300) is arranged for transmitting rotating reaction forces from the core drilling machine (100) to the object (400), and
• the core drilling machine (100) has a drilling shaft (107) with a tubular configuration allowing the reaction bar (300) to be arranged radially inside the drilling shaft (107).